Transmission mechanism.



A. KRIEG. TRANsMrssioN MEcHANrsM. APPLCATION FILED MAR. 26. 1911.

A. KRIEG. TRANSMISSION MEcHIIIIIIsIvI. APPLICATION FILEU MAR. 26, 1917.

Patented Mar. 25, 1919.

3 SHEETS-SHEET 2. j G) QII @I I L@ In@ w w 'I fI I @I I@ N I (Q N ,Ig NI II w N @I A. KRIEG, .TRANSMISSION MECHANISM. APPLICATION FILED MAR. 26. 19H.

Patented Mar.-25,19f9.

3 SHEETS-SHEET 3.

ALFRED KRIEG, OF MINNEAPOLIS, MINNESOTA, ,tSSGNOR Ti) EliERSGi-EANTNG'EEAHI i l COMPANY, 0F ROCKFORD, ILLINIS, A. CGRPORATION 0F JLXMQS.

mesmo.

Specification@ Letters Patent.

To all whom it may concern?,

Be` it known that ,`ALFnnn KRIEG, a citizen of the United Statesresifli`ng' at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Transmission Meehanisms, of' which the following is av specifica-v tion. 4 This invention'relates in 'geiieral to translO mission mechanisnis,- and has more partienlar reference'to a transmission for gas traetor's.' i i @ne of the primary objects oi' my present invention is to provide a transmission. which Willbe simple and compact in construction, one which `Will-loe strong and durable, and which can be manufactured ata relatively low cost.

Another object o' my linvention is the 'provision of a transmission which will he adapted to supply three speeds forward anr'i one sReecl reverse 'rom a constantly driven power shaft.-

A further object of my invention is to provide'a novel arrangement of sliding gears which caribe-easily and quickly n'ianipulnte i to give the desiredspeed Changes,

Still another object oi my invent-ion is to -eompactly arrange vthe differential gearing 60. which is connected with the driving meinbers through which power is transmitted independently vto the driving Wheels of the tractor, within the hub of the driven `gears of the transmission, so that the transmission and the lierential are eompaetly anfrangeilL as a's'ingle driving unit. Still another object of invention is to .provide a brake which will cooperate with the driven gea-rs of the transmission so that 40 the brake will he'nmilied4 directly to these g'ears at a. point remote from their center oi' rotation, with 'the result that a powerful leverage is exerted by the brake'suiiieien; to

eil'eetually control the traetornnder any eonditions of use. si

v For Ithe purpose of facilitating an understanding of my invention I have illustratori.

one preferred embodiment thereof on the accompanying drawings, from an inspection of which, when considerecinn connection with the following description, 'my invention and man?,r ofits inherent advantages shonhl be readily appreciated. 1 Referring' to the 'draWngs,-

55. Figure is a horizontal sectional viewA through a transmission enfoui/ving mv invention.

l q v l d" u Fig', Q is a vert-wai seetonai view through the construction shown ni l, certain parts being broken away to more clearly show the underlying eierneniis, and

Referring` to the drawings, reir-.rence character o indicates generally the :traine conf struction ot' the transmission whioh is adapted to be secured b v bolts or otherwise to the iframe o1? the trac-,ton ami is shaped to provide a easing i3 suitable size and shape to .'aoconnneclate the mechanism hereinafter described,

The torner end of 'the easing"l is shaged to provide a iongituciinal'ij; extending hex ring,` i', in which is rotatal'ily mounted the shaft 8, the' forward emi of which is irovideil with coupling member 9 afiaptefi 'to he di reetiy connected toV the drive shaft oi a longitudinally ciisposed gas engine mounted upon the tractor frame in front of the transmission. ihe rear end of the shaft il within the easii isequipperl "fit-h a "bevel gear l meshing ith a companion bevel l2 iixe upon' transverse power shaft 13 mounted .in roller or oth-r suitable hearings 14 and l5 anfl carrying :it its outer enfl a belt pulley i6, fronx whirh power is transmitted when the tractor is used as 'a stationary engine. .It will he manifest that the shaft lli is oontinuouay driven from 'the shaft 8 mul when the varioi'is par are in theposition. shown in Fig'. l the shaft 13 iviil revolve idly without transmitting' power tothe driven members oi the transmission nieohnnisnn wnnh will nowhe oescrioed.

1llv'vizliinthe lrear portion of `the transmission Casing 6 there mounted a pair ot axially elio-eti shafts ll' and i8 Carried near their outer end by roller or other suitahle hearings 19 and equi pped at their eXtreme outer ends with driving' pinions 2l and 22 respectively, which mesh with and (lrive he large gears inerlly mounted upon the trae- -ion Wheels of the machine. The inner ends o1" the' shafts il' and i8 project into 'a revolving housing comprisingI 'the center piece 2? and the end pieces 2 and `25 respetively, whirh nre rotatal'ily nioun-tefi in roller or other suitable hearings 2G and 2T, all, as liest shown in Fig. i.. The nieves or .sections i223, Jf and 25 are rigidly fastened together by means` of bolts 2S to forni a rigid housing', within which is disposed the differential. The differential consists, in the present instance. of a pair of opposed bevel Ifears if!) and 31 splined respectively 'upon the inner ends of the shafts 17 and 18 and meshing' with a driving bevel gear 3'2 which is iournaled iiA on a stub shaft 33 extendineY radially inwari'llj.' between the bevel gears "itl and :il from the central member 23 of the lions-ingr. lt will be obvious that as the housingiis revolved the shafts 1T and 18 will be rotated at equal speeds. When lthe machine is turning a corner or when. for any 'other reason. greater resistance is offered to one of the pinions 21 or 22 than is offered to the other the differential mechanism will .permit relative movement between the shafts so as to compensate for the turningmovement or for the unequal resistance. offered,

thereby acting' as differentials customarily act 'under similar conditions.

The central member 'ilof the ditlerential i housing' is provided with a` radially extend- .outer shaft 13 so' as'to be movable longitudinally along); the shaft.. '.l`hese fears are proportioned so as to mesh respectively with the gear. t? and the. gear 85. Normally, gears '39, 41 are, in the neutral posit-ion shown in Fig. l, in which they do not mesh with either of the driven rgears. llhenit is desired to proceed at low speed the gear il is moved into mesh with the gear 35. so that power is transmitted dir'eet-ly from the shaft 13 through gears all and 35 to the differential mechanism which drives the shafts 1Tv and '19. .lVhen seeond'speed forward is desired the gears 39 and -tl are moved bodily .in the. opposite direction until rear 39 meshes with rear 3 6, whereupon the transmission mecha.-

mami is (l1-ivan ata higher speed from the shaft 13. Aihird gear 42 is splined upon the shaft 13 and normally assumes the neutral position shown-nr Fig'. 1. When high speed forward is desired gears 39, t1 are, moved to neutral position and gear 42 is moved into intermeshing relation witlrgear titi, whereupon.the shafts 17 and lb are driven at high speedY forward, as will be.

'readily understood.

'lhe gears a). -ll and 42 may be. moved longitudinallv upon the shaft' bv any suit- Vable rear-shiftin,g' mechanism, but in the These mesme present instance I have shown, for purposes of illustration merely, a pair of longitudinally movable rods -13 and 44 suitably mounted in the easing` the rod 43 being' provided with a :forked arni 45 adapted to engage in a groove to formed in the hub of the gear titl, and the roda-1L being' equipped with a. similar forked arm il adapted to engage in a groove 4&1 formed in the hub of the ,g'ear l-Q. It will be obvious thatr longitudinal movements of the rods -iti and -Li will shift the driving gears into o1'l out of meshing' relation with their respective. (lriven g'ea-rs. .tny suitable. or preferred mechanism may be employed for shifting the rods 43 and it, and this mechanism in practice is located in a convenient. position to the. driver of the tractor. As illustratingr a simple operating mechanism, however. .l have shown in Fig'. the rod 43 as cmmected with a pivoted lever i9 and the rod 4l connected to a similar lever 51.. .Rocking movements of these. levers aboutv their pivots will impart the necessary longitii'dinal movements to the rods. i 'y c In order that the tractor may be reversed without reversing); the engine l have provided an auxiliary pair of gears. best shown in Figs. '2 and 3. lh'ese gears, which are" numbered 52 and 53, are castintegral and are slidingly mounted upon a stationary sha ft 5i extendingr transversely of .the. ear 'asino above the rotatalile sha-ft 13. AYornially these lQ'ears are in neutral position,v as shown in Fig'. B .but when it is desirable to reverse, the. gears are moved to the left on the shaft. 5l, viewing' Fig. 3. iint-il gear 5;) meshes with driven gear 3G and gear 5? meshes with driving' ,gear 39. Gear 3G, and therebyi the differential mechanism driven shafts, will thus be rotated in a reverse direct-ion from the direction in which they are. rotated when the driving' gear 39 meshes directly with the gear 3G.

AFor the purpose of shifting the reverse gears l have provided another longitudinally movable i'od 55, which,4 is equipped with a bifurcated arm :3G/engaging in a groove 57 formed in the hub of the gear 52. A. shifting'lever 5S, or other preferred meetianism, will be employed for imparting longitudinal movement. to the. shiftingr rod 55.

.ln order to obtain a long leverage and av very effective brake for the mechanism above described, and a brake. which will be unich simpler and more certain in ope 'ation than the ordinary band brakes heretofore employed. I have provided a brake mechanism which eope'ates directly with the driven gears, and whielrwill now be explained. Referring to Figi. 1 and 2, it will be observed that the' inner periphery of the gear 35 outside the carrying web 34. is provided with a rather deep wedge-shaped groove (il. Adjacent the 'outer face of the and mesmo gear I have journaled in a bearing 62 formed in the gear casing a short shaft 63 which has mounted upon its inner end a 'Wedge-shaped brake member or shoe 64,

which is preferably secured to the shatt 63 by a clamping bolt 65 andalso a key or spline 65. The outer end of the shaft ,63 is equipped with a lever S7 to Which is attaehed a link 68 connected with a foot pedal 0r other devicel under the Control of the operator, by means of' which the shaft 63 may be rocked to force thewedgershaped brake shoe into the groove 6l of the driven gear. The Wedging action of the bleek or shoe. 64 produces a very strong braking aetion, which is further augmented by the fact that the point of application of the brake power is a considerable `distance trom the center of rotation of the driven gears, thereby affording a' long leverage, which results in a most effective braking action.

It is believed that my invention in one et its preferred embodiments and its mode of operation will be understood from the toregoing Without further deseription, and it should be manifest that various changes in the structural details illustrated and deing shaft, a transverse, intermeriliate shaft connected by bevel gears to the driving shatt, a transverse sectional driven shaft provided with a differential mechanism in" longitudinal jalinement with the driving shaft, rigidly. united first, second and third speed driven gear, and means for shifting 'said' driving gears into meshing relation with theireonipanion driven gears.

2. In ,a transmission mechanism of the character described, the combination of a longitudinally extending driving shaft, al

transverse intermediate shaft connected by bevel gears to the driving shaft, a transverse sectional. driven shaft provided with a differential mechanism connecting the shaft sections, three rigidly united driven gears mounted eoneentrieally on the easing of the diilerential4 'neehanism at one side ot' the bevel gear on the intermediate shaft, a pair ot rigidly united driving gears splined on the intermediate shaft and interposed between two of the driven gears so as to respectively mesh with their companion driven gears when moved transversely in gear splined on the intermediate shaft for meshing with the remanung driven gear,

and means for shifting the' driving gears opposite directions, an independent driving 

